Circuit controller



Oct. 9, 1934. T. B. cox

CIRCUIT CONTROLLER Filed June 9, 1955 Inventor .2 flames E. Cox.

I II Patented Oct. 9, 1934 UNITED STATES PATENT OFFICE 2 Claims.

This invention appertains to new and useful improvements in a circuitcontrolling device for a battery indicator.

The principal object of the present invention is to provide means in theform of an indicator for mounting adjacent the drivers seat inconjunction with means in a secondary battery, whereby, when desired,the driver can determine whether or not his battery has a safe level ofelectrolyte therein.

Other important objects and advantages of the invention will becomeapparent to the reader of the following specification.

In the drawing:

Figure 1 represents a vertical sectional view through one of the plugs,taken substantially on line 44 of Figure 2.

Figure 2 represents a side elevational view of one of the plugs.

Figure 3 represents a lower end elevational View of one of the plugs.

Referring to the drawing, wherein like numerals designate like parts, itcan be seen that in carrying out the present invention, a special typeof plug is employed, which is generally referred to by numeral 5. Thisplug consists of the elongated cylindrical core 6 having an opening '7extending across the lower end thereof. A vent opening 8 extendslongitudinally through this core 6 from the vent 7 to open through theupper end of the core and as is clearly shown in Figure 1, a pair ofelectrodes of suitable conducting material and denoted by numerals 9-9are embedded in the core with their lower ends projecting in convergingrelation into the said cross opening 7, while their upper ends areattached one to a corresponding jumper 10.

The upper end portion of the core 6 is reduced and provided with threadsfor threaded disposition into the cap 12 which is provided with adepending externally threaded apron 13 which is spaced from the core 6.Suitable packing means 14 is installed between the core at the shoulder15 and the cap 12 and as is clearly shown in Figure 1, a peripheralportion of the cap 12 is threaded to engage into the internally threadeddielectric cover 16 which has a central opening registering with thevent 8.

The novel plug 5 can be engaged into the usual 60 plug opening of thebattery, so that the threads 13 engage into the usual threads in theplug opening.

While the foregoing specification sets forth the invention in specificterms, it is to be understood that numerous changes in the shape, sizeand materials may be resorted to without departing from the spirit andscope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:-

1. A plug of the character described comprising a threaded cap member, adi-electric core body provided with a reduced threaded portion at oneend, said cap being provided with a threaded bore for receiving thereduced threaded end of the core, said core being provided with a ventopening extending longitudinally therethrough, an electrode extendinglongitudinally through the bore and exposed at the end of the coreremote from the threaded end, said reduced and threaded end of the coredefining a shoulder, and packing means interposed between the shoulderand the said cap.

2. A plug structure of the character described comprising a cap memberprovided with a threaded bore therein, a di-electric core memberprovided with a threaded end for engagement into the said threaded boreof the cap, the threaded end of the core being provided with a reducedextension donning a shoulder, an electrode extending longitudinallythrough the core and being exposed at one end at the end of the coreremote from the threaded end and at its opposite end through theshoulder defined by the reduced end of the core, and a cover fordisposition over the reduced end of the core and over the top of thesaid cap.

THOMAS BLACKWOOD COX.

